ˈseks.tɪ.lɪ.ən

Definitions

1. noun

A very large number, equal to 1 followed by 21 zeros, or 10^21.

“The enormous population of the planet was measured in sextillions.”

2. noun

A unit of time, equal to 1 sextillion years, used in astronomy and cosmology.

“The age of the universe is estimated to be over a sextillion years.”